Side pocket mandrel

ABSTRACT

A side pocket mandrel for providing a top entry electrical connection from a bottom location in the mandrel comprised of cylindrically shaped parts ( 119   a-   119   g ) connected end to end to form an elongated housing having an offset full opening bore where said housing has 1) a laterally offset upper recess ( 167 ) in communication with the full opening bore for receiving a well tool ( 117 ) moved laterally from the full opening bore, 2) a lower laterally offset pocket bore ( 125   a,    125   b ) for receiving the well tool, 3) a laterally offset lower recess ( 127 ), 4) at least one laterally offset, longitudinally extending and separately located pipe bore ( 140 ) extending alongside of the offset pocket bore for connecting the upper recess to the lower recess, and 5) at least one outlet bore ( 168 ) extending between the upper recess and the housing&#39;s exterior.

PRIOR APPLICATIONS

This application is based upon a provisional application accorded afiling date of Nov. 15, 1995 and serial No. 60/003663.

RELATED APPLICATIONS

This application is related to the disclosure in U.S. Pat. No.5,457,988, issued Oct. 17, 1995 and entitled “Side Pocket MandrelPressure Measuring System”.

This application is related to the disclosure in U.S. Pat. No. 5,455,573issued Oct. 3, 1995 and entitled “Inductive Coupler For Well Tools”.

FIELD OF THE INVENTION

This invention relates to side pocket mandrels for use in well tubingstrings or production tubing in a well bore. More particularly thisinvention relates to side pocket mandrels and methods of constructionthereof for use in coupling one or more electrical conductors from aside pocket mandrel to the earth's surface for obtaining real timedownhole measurements and data.

BACKGROUND OF THE INVENTION

Side pocket mandrels are typically installed in a string of productiontubing in a well bore. The mandrel is provided with a full opening borewhich is aligned with the bore of the production tubing and with alaterally offset side pocket bore which receives a side pocket welltool. Side pocket well tools can be passed through the production tubingand are retrievably seated in the side pocket bore to perform or tomonitor operations in the well bore or production tubing. A side pocketwell tool is retrievable and can be seated and recovered from the offsetbore by use of a kickover tool, or similar tool. Side pocket well toolsheretofore typically have included flow control devices, gas-liftdevices, chemical injection devices and so forth, for use inconventional production operations.

In a typical construction, the side pocket mandrel has a mandrel bodysection with the full opening bore and the body section is connected toforged upper and lower body sections by butt welds. To latch a tool inan offset side pocket bore, a valve latching lug or clamp is located inthe mandrel body to cooperate with the side pocket well tool. Weldingusually requires that the assembly be heat treated to relieve stress.

In some instances, a desire has been expressed to have an single wireelectrical take out from a side pocket mandrel for data transmission tothe earth's surface. This can be difficult because of welding and heattreatment which can destroy or adversely affect any electricalcomponents. Further, even when separately installed, a bottom locatedelectrical take out is difficult because the wire is easily damaged whenthe production string is moved through a well bore.

In the present invention the system for manufacturing a side pocketmandrel and its construction permits an electrical takeout at the top ofthe mandrel and/or the bottom of the mandrel and permits installation ofan inductive coupling device in the lower end of the mandrel.

One purpose of an electrical takeout on a side pocket tool is to monitorthe pressure of the fluids over a period of time as a function of realtime by connection of a downhole pressure measurement tool with anelectrical conductor extending to the earth's surface for datatransmission. In present systems to obtain a real time pressuremeasurement, a pressure gauge is attached to the exterior of the stringof tubing. The gauge, the tubing and an attached electrical conductorwire are located in a well bore. Should a problem arise with the tool orfor any other reason which might require removal of the tool, the wellmust be killed and the gauge retrieved with the string of tubing.Obviously, this is expensive and time consuming.

A proposed system, such as described in the OTC paper 5920, 1989entitled “A Downhole Electrical Wet Connection System For Delivery andRetrieval of Monitoring Instruments by Wireline” uses a side pocketmandrel and pressure gauge with a downhole “wet connector” for couplingpower to a tool and for read out of data. “Wet connectors” in a highpressure, corrosive environment ultimately corrode. In making up theconnection, it is often difficult to make connections because of mud ordebris in the well bore. Moreover, brine in the fluid causes electricalshorting of circuits. In short, an electrical wet connector is notreliable and this is particularly true over a period of time.

In another type of system known as a “Data Latch” system, a batterypowered pressure gauge is installed in a mandrel which has a bypass. Awireline tool with an inductive coil is latched in the bore of themandrel while permitting a fluid bypass. The inductive coil on thewireline tool couples to a magnetic coil in the mandrel for obtaining aread out of real time measurements. The system does not provide downholepower to the tool and battery failure requires killing the well andretrieving the tool with the well string.

Inductive coupling devices are difficult to construct for a downholeenvironment and yet are extremely desirable devices for downhole toolsas a replacement for the above systems. Moreover, a system for real timemeasurement and monitoring of pressure, flow velocity, and temperatureon a more or less permanent basis is highly desirable.

SUMMARY OF INVENTION

In the present invention a side pocket mandrel is an integral assemblywith a lower end section, a side pocket housing section, and an uppertakeout section where said sections are seelingly interconnected anddefine a full opening bore in alignment with a longitudinal axis of aproduction tubing. The side pocket housing section has a full openingbore and an offset side pocket bore which is laterally offset withrespect to the full opening bore. The side pocket bore is constructedand arranged to receive a side pocket well tool with a tool inductivecoupling member and includes a guide channel above the side pocket bore.

The assembly includes a side pocket inductive coupling member fixed inthe lower end of the offset side pocket bore to receive the toolinductive coupling member and to provide an inductive couplingrelationship so that electrical power can be provided to a well tool inthe side pocket bore and data transmission can be made from the welltool to the side pocket inductive coupling member. The full opening borein the side pocket housing section is continued through the lower endhousing section by a tubular member which defines a chamber between theouter wall of the tubular member and the inner wall of the end housingsection.

The side pocket induction coupling member has an electrical wiredisposed in a pliable tubing conduit which extends into the chamber andthrough a longitudinal bore in the side pocket housing. The longitudinalbore in the side pocket housing is coupled by a tubular longitudinallyextending pipe member to a take out bore in the upper take out section.The tubing conduit extends through the pipe member and the take out boreand is connected to an electrical pressure connector at the upper end ofthe side pocket mandrel.

In assembly, the tubing conduit in the side pocket mandrel and theconnected side pocket inductive coupling member are jointly shifted tomove the side pocket inductor coupling member into the side pocketoffset bore while moving the tubing conduit exterior to the take outhousing. When the tubing conduit is exterior to the take out housing,the electrical pressure connector can be connected up to the tubingconduit. Then the tubing conduit and the connected side pocket inductivecoupling member are jointly shifted to a position where the electricalpressure connector is pressure connected in the take out housing and theinductive coupling member is located in its operative position in theside pocket bore. The electrical connector is enclosed in a chamber by atubular member which is located in the lower housing section. A threadedend member is sealingly attaches to the lower housing section andprovides a continuation of the full opening bore with the tubularmember.

The various sections of the side pocket mandrel can be connected bywelds which can be heat treated independently of installation of theinductive coupling member so that the coupling member is not adverselyaffected by a heat treatment. In forming the welded joints, the adjacentends to be welded are provided with an exterior welding chamfer andinternal wall recesses. When welded together, the mating recessesprovide a full flushing recess at each welded connection.

DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic view in cross-section through a well borecontaining a production packer and a side pocket mandrel with a pressuregroup;

FIG. 2 is a schematic view of a pressure gauge which can be utilizedwith the present invention;

FIG. 3 is a view in longitudinal cross-section through the side pocketmandrel and housing using an inductive coupling probe member and anupper electrical take out;

FIG. 4 is a view in cross-section taken along line 4—4 of FIG. 3;

FIG. 5 is a perspective view of the side pocket housing part of thepresent invention;

FIG. 6 is a view in cross-section taken along line 6—6 of FIG. 3;

FIG. 7 is a view in cross-section taken along line 7—7 of FIG. 3;

FIG. 8 is a view in cross-section taken along line 8—8 of FIG. 3;

FIG. 9 is a view in partial longitudinal cross-section through apressure coupling at the upper electrical take out;

FIGS. 10-15 are schematic views in longitudinal cross-section toillustrate one form of construction of a side pocket mandrel embodyingthe present invention;

FIG. 16 is a view in partial cross-section of a flow meter which can beutilized with the present invention;

FIG. 17 is a view in partial cross-section through another form of thepresent invention;

FIG. 18 is a transverse cross-section to illustrate another form of thepresent invention; and

FIG. 19 is a schematic view of another form of the invention.

FIG. 20A-FIG. 20D are end to end views in partial cross section of awelded form of the tool;

FIG. 21 is an enlarged partial view in cross section illustrating adetail of the present invention;

FIG. 22 is a view in cross section taken along line 22—22 of FIG. 20A(lines may be omitted for clarity of presentation);

FIG. 23 is a view in cross section taken along line 23—23 of FIG. 20A(lines may be omitted for clarity of presentation);

FIG. 24 is a view in cross section taken along line 24—24 of FIG. 20C(lines may be omitted for clarity of presentation);

FIG. 25 is a view in cross section taken along line 25—25 of FIG. 20C(lines may be omitted for clarity of presentation);

FIG. 26 is a view in cross section taken along line 26—26 of FIG. 20D(lines may be omitted for clarity of presentation);

FIG. 27 is a partial view in cross-section of the connection at the toppart;

FIG. 28 is a partial view in cross-section of the inductive couplerposition relative to the conduit position in an assembly mode; and

FIG. 29 is a partial view in cross-section of the top part when theinductive coupler is in the position shown in FIG. 28.

DESCRIPTION OF THE INVENTION

Referring now to FIG. 1, a well bore is illustrated schematically wherea well bore 10 transverses earth formations and where a liner 11 iscemented in place. Production fluids are produced through perforations12 in the well liner and direct through a tail pipe on a productionpacker 13 to a string of tubing 14 for travel to the earth's surface.Along the length of the string of tubing are one or more side pocketmandrels 15 which are constructed and arranged according the presentinvention to internally receive a retrievable side pocket well tool suchas a pressure gauge 16 (shown in FIG.2). The pressure gauge 16, wheninstalled in a side pocket mandrel 15, has an inductive coupling memberpositioned relative to an inductive coupling member in the side pocketmandrel 15 to be inductively powered and to passively transmit pressuredata from the pressure gauge to the inductive coupling member in theside pocket mandrel. Other side pocket devices can be employed wheredata or control functions are transmitted from the earth's surface to adownhole tool. The inductive coupling member in the side pocket mandrelis connected by an upper electrical takeout at 17 to a conductor cable18 in an external conduit which extends to the surface of the earth fora surface read out and recording of the downhole data on a real timebasis.

Referring now to FIG. 2, the pressure gauge 16 is sized for insertionthrough a string of tubing on the end of a wire line cable. A wire linecable with a side pocket positioning device (not shown) is attached tothe well tool by a conventional releasable coupler 19. A typical O.D. ofthe pressure gauge is 1.5 inches or less. The tool contains anelectronics section 20 for electrically processing and powering theinstrumentation, a temperature sensor section 21 for sensing temperatureand a pressure sensor section 22 for sensing pressure or flow. Anopening 25 admits pressure to the pressure sensors in the pressuresensor section 22. At the lower end of the tool is an inductive couplersection 27 with a socket member 28.

Referring now to FIG. 3, a side pocket mandrel 15 is illustrated asinterconnected between adjacent tubing pup joints or sections 14A and14B of a string of tubing or production tubing 14 so as to form a partof the string of tubing.

The side pocket mandrel 15 is generally an elongated cylindricallyshaped member formed by four sections or parts comprising, from top tobottom, respectively, an upper takeout housing part 36, a body pipe part38, a side pocket housing part 40, and a lower housing part 42. Eachmandrel part 36, 38, 40, 42 respectively has aligned full opening bores36A, 38A, 40A, and 42A which are equal or larger than the bore of theproduction tubing 14. The full opening bores extend through the lengthof mandrel 15 so that the mandrel 15 has an effective full opening bore.The effective full opening bore permits wireline side pocket well toolsand other small diameter tools to pass through mandrel 15 to locationsbelow and in the mandrel 15.

In the side pocket housing part 40, a side pocket bore 40B is locatedgenerally parallel to and laterally offset from the full opening bore40A. The side pocket bore 40B is sized to receive a pressure gauge 16 orother side pocket tool. The bores 40A and 40B may be more clearly seenin the cross-section of the housing part 40 as illustrated in FIG. 4.

Referring to FIG. 3 and FIG. 5, the configuration of the side pockethousing part 40 may best be understood from a description of itsmanufacture. A cylindrical bar stock is drilled to form the longitudinalbores 40A and 40B. One end of the bar stock is threaded at 40C forattachment to the lower housing part 42. The section of the bar stockabove the length of the side pocket bore 40B is reduced in diameter andthreaded at 40D to provide for a threaded attachment to the body pipepart 38. The diameter of the upper part of the bore 40B is enlarged. Acrescent shaped latch 40E is located in the enlarged bore portion. Thenthe bar stock is cut away in a lengthwise direction between the bores40A and 40B from the upper end of the housing part 40 to the thread at40D. The connecting material between the enlarged bore and thetransverse cut away surface 40H is cut away to define a generally “U”shaped longitudinally extending groove 40F with the latch crescent 40E.The upper end of the housing part 40 is provided with a beveled surface40G for selective operation of a kickover tool.

Extending lengthwise through the housing part 40 and offset from theside pocket bore 40B and the full opening bore 40A is a conduit bore 41which is sized to pass an electrical conductor and conduit therethrough,(See FIG. 6).

At the lower end of the side pocket bore 40B are fluid bypass ports 40Jwhich are slots to place the bores 40A and 40B in fluid communication sothat a well tool 16 can be received in the bore 40B. Also disposed inthe lower end of the bore 40B is an inductive coupling probe member 45.The coupling member 45 is attached to the lower end of the bore 40B in amanner which will be described more completely in the description tofollow and cooperates with a socket coupling member on a well tool.

The lower housing part 42 shown in FIG. 3 may best be described by itsmanufacture. A cylindrical bar stock is machined to provide a bore 42Bwith an internal thread for threaded attachment to the thread at 40C onthe housing part 40. The bore 42B terminates at a transverse end surface42C. The end of the bar stock is then machined to provide an internallythreaded bore at 42D to receive the threaded end of a tubing pup joint14B. An offset bore 42E which is full opening is aligned with the bore42D. The internal end surface 42C forms an abutment. The exterior of thelower housing part 42 can be beveled (see 42F) for installation purposesin a well bore.

The lower end of the full opening bore 40A in the side pocket housingpart 40 is provided with a counterbore which is sized to receive atubular protection housing 52. The housing 52 defines the full openingbore 42A and is retained in the counterbore by engagement with the endsurface 42C. It will be appreciated that the outer wall of the housing52 and the inner wall of the bore 42B define an enclosed chamber 53where a tubular conduit 54 attached to the inductive coupling member 45can be positioned and passed upwardly through the conduit bore 41.

Again referring to FIG. 3, the upper body part 38 is a tubular memberwith an internal bore 38A and an enlarged lower bore 38B which isinternally threaded at its lower end at 38C. The lower end of the part38 is threadedly coupled to the thread 40D of the housing part 40. Whenassembled, the bore 38B receives the upper cut away portion of thehousing part 40, (See FIG. 6).

The take out part 36 is made from a cylindrical bar stock and has alower outer threaded section on a reduced diameter portion of the part36 which threadedly receives the threaded bore of the part 38 for acomplimentary fit. The central portion of the part 36 has an offsetenlarged bore which receives a tubular deflector 36B. The tubulardeflector 36B has guide means 36C which guide a kickover tool fororientation relative to the offset pocket bore 40B. The upper end of thepart 36 has an offset internally threaded bore for threadedly receivinga tubing sub 14A. The tubing sub 14A engages the deflector 36B which islocked in rotative position by a locking key 14C, (See also FIG. 9). Theupper end of the part 36 has a recess 36D in which a take out connector56 is located. The takeout connector 56 has an extension conduit 54Awhich is coupled to the connector or conduit 54 from the inductivecoupling member 45 at a well connection 54C. In the open space betweendownwardly facing shoulder on the part 36 and the upper surface of thepart 40, a tubular pipe member 41A extends longitudinally between thebore 41 (FIG. 4)in the part 40 and a bore 41B in the part 36 (FIG. 9).The pipe member 41A protects and encloses the tubular conduit 54 withrespect to the open space.

The threaded joints between parts 36,38,40, and 42 are sealed.

Referring now to FIGS. 10-15 and one form of manufacture of the mandrels15 of the present invention, after the parts 36, 38, 40, 42 are machinedas described, the assembly begins with part 40 (FIG. 10) with respect tothe upper housing part 36, the deflector 36B is inserted and positionedin the part 36 and the tubing joint 14A attached thereby to form asubassembly 60. The pipe part 38 is threadedly connected to the sidepocket part 40. The subassembly 60 is then threadedly connected to thepart 38 and the bores 41B and 41 are aligned. The pipe 41A is insertedthrough the bore 41B and seats in a counterbore in the bore 41 in theside pocket part 40. (FIG. 11). Next, the inductive coupling member 45is inserted into the side pocket bore 42A to a location above the lowerend 61 of the side pocket bore 42A. The inductive coupler 45 is attachedto a metal pliable tubular conduit 43 which passes through a seat 63 andlock nuts 63. The conduit 43 extends downwardly from the inductivecoupler 45 and is curved in a “U” shape to extend upwardly through thebore 41, the pipe conduit 41A and the bore 41B to a location above theupper end of the upper housing part 38. The extension of the conduit 43above the upper end 65 of the part 38 is about the same as the distancethe coupling member 45 is located up above the lower end 61 of the sidepocket bore 42A. A single wire conductor is disposed within the conduit43 for data communication purposes. At the upper end of the conduit 43,the single wire connector is coupled to a pressure sealing device suchas a “Kemlon” connector 66. The connector 66 is welded or bonded to theconduit 34 (See 54C, FIG. 9) while the single wire conductor is attachedto a coupling pin on the connector 66. A tubular lock nut 68 (See FIG.9) is slid over the end of the connector 66. The connector and theinductive coupling member 45 are simultaneously lowered to a positionwhere the inductive coupling member 45 is in the lower end of the sidepocket bore 42A of the part 40 and the lock nut 68 is threadedly coupledto a threaded bore in the part 36 to lock the connector 66 and the pipe41B in a fixed position. (See FIG. 13). The inductive coupling member 45at the lower end of the side pocket bore 42A is secured to the seat 62by the attachment nuts 63, (See FIG. 17). Next, the protective sleeve 52is inserted into the side pocket part 40 and the lower housing part 42is threadedly attached to the side pocket part 40 to enclose the conduit43 in the chamber 33. The sleeve 52 fixes the seat 62 relative to theside pocket part 40. The side pocket mandrel can be thus constructed andassembled without requiring any heat treatment.

While threaded and sealed connections are suitable in some instancesthere is a reluctance to utilize a side pocket mandrel which is notwelded pressure tight. As shown in FIG. 9, the threaded parts areprovided with outer annular weld grooves 70 adjacent to the facingconnections. With this arrangement the cylindrical configuration can beeasily welded at the junction of the facing connection without requiringheat treatment.

Referring now to FIG. 16 a side pocket mandrel 15 is illustrated with aflowmeter 72 in the side pocket bore 42A. The flowmeter 72 may be of thetype illustrated in U.S. Pat. No. 5,463,903 issued Nov. 7, 1995. Theflowmeter 72 has an inductive coupling socket 74 while seats on aninductive coupling probe member 45. The flowmeter 70 is attached to alatching mechanism 78 which is conventional. Thus, use of a flowmetercan be made in a side pocket mandrel.

Referring now to FIG. 17, the inductive coupling member 45 is slidablyreceived in the lower end of the side pocket bore 42A, the couplingmember 45 has a tapered seat portion 78 which seats in a ring memberseat 62. The protective pipe 52 has a reduced diameter section 80located so as to engage and fix the ring member seat 62 relative to theoffset pocket bore 42A. In FIG. 17 the conduit 54 includes a “Y”connection 82 which permits a conductor wire conduit 84 to be connectedto a pressure connector 56 and thus provide continuity to a lower sidepocket mandrel installation.

Referring now to FIG. 18, a side pocket mandrel can have side by sideoffset pocket bores 86, 88 for respectively different well tools such asa pressure temperature gauge tool and a flowmeter tool or two pressuregauges. The bores 86, 88 are offset from a full opening bore 90. Theelectrical conduits for the well tools can be combined with a “Y”connection similar to that described with respect to FIG. 17 and passedthrough a single bore 92. Alternately, a second bore 94 (shown in dashedline) can be provided. Similarly, the take out housing can be modifiedto have an internal or external “Y” connector or two electricaltake-outs. It will also be appreciated that more than one electricalwire can be utilized with the present invention.

With respect to use of the side pocket mandrel with inductive couplingwell tools and data transmission, reference is made to U.S. patentapplication Ser. No. 08/114,059 filed Oct. 23, 1993, now U.S. Pat. No.5,457,988, and to U.S. patent application Ser. No. 08,358,704, filedDec. 19, 1994, now U.S. Pat. No. 5,455,573, issued Oct. 3, 1995.

In another form of construction, instead of threaded connectors betweenthe parts (for example, as shown in FIG. 19) parts 36, 38 and 40 can bebutt welded at locations 100, 102 and 104. The lower end 106 has acylindrical section 106A which can be threaded into an open end on thelower part 42 so that an offset bore 106B aligns with the fill openingbore 40A through the mandrel. An end wall 106C can be provided with aconnector bore as described with respect to FIG. 17.

With the forgoing system, it will be appreciated that a single wireconduit system can be utilized with multiple side pocket mandrels whereconventional electrical accessing protocols can be used to address andcontrol individual tools or units in a respective side pocket mandrel.

Referring now to FIGS. 20A-20D, a preferred mode of a side pocketmandrel 115 is illustrated from a bottom end in FIG. 20A to a top end inFIG. 20D for connection in a string of tubing or production tubing 14 soas to form part of the string of tubing. In FIGS. 20A and FIG. 20B aretrievable pressure gauge 117 is illustrated within the side pocketmandrel and also separately to the right of the side pocket mandrel.

The side pocket mandrel 115 is generally an elongated cylindricallyshaped member formed by a number of sections or parts 119 a- 119 g.These various parts 119(a-g) are made in various lengths formanufacturing and assembly. As will be apparent from the disclosure tofollow, the parts are simple to construct and assemble for alignment ofthe various bores.

The lowermost housing part 119 a ( see FIG. 20A, FIG. 21, FIG. 22) iscylindrical in cross section and is connectable to a string of pipe ortubing 14 and has an offset full opening bore 121 which is in alignmentwith the bore of the tubing 14. An enlarged bore 122 in the upper end ofthe housing part 119 a has an internal thread 123 which threadedly andseingly couples to an external thread 124 on a connector housing 119 b.The bore 122 is located about a central axis for the housing part 119 a.

The connector housing part 119 b has a side by side located offsetpocket bore 125 and a full opening bore 121 a. The full opening bore 121a has an enlarged bore portion 126 a to receive a tubular protectionmember 126 which has a full opening bore 121 b and which extends to ajuncture proximate to the bottom surface of the enlarged bore 122. Thetubular protection member 126 effectively provides a chamber 127 withinthe enlarged bore 122. The housing part 119 b also has a lengthwiseextending bore 140 which aligns with a bore in a plate member 132 forpassage of a tubular line conduit as win be explained hereinafter. Theupper end of the housing part 119 b has an exterior chamfered edge 129for exterior welding and an interior recess 130 in the wall for fluidaccess. Prom the forgoing description, it can be seen that the housingpart 119 a and the housing part 119 b are easily machined andconnectable.

Disposed in the offset pocket bore 125 of the housing part 119 b is aninductive coupling member 45 with an upwardly extending probe 45 a whichis centered in the bore 125. The lower end of the coupling member 45 hasa tapered surface to seat in a tapered surface of an opening in theplate member 132. The plate member 132 is semi circular (see FIG. 22)and is bolted by bolts 134 to the housing part 119 b. A nut connection135 attaches the coupling member 45 to the plate member 132. Thecoupling member 45 has a flexible tubular line 43 for an electricalconductor and the tubing line 43 is containable within the chamber 127and can pass between the wall of the protection member 126 and the wallof the bore 122 before passing into the opening in the plate member 132and through the longitudinally extending bore 140 in the part 119 b toextend to the upper end of the side pocket mandrel. The flexibility ofthe tubular line member 43 and the capacity of the chamber 127 tocontain the tubular line member 43 assists in the assembly as willhereinafter be more apparent.

Connecting part 119 c is cylindrical with three longitudinally boredopenings to define the full opening bore 121 b, the side pocket bore 125a and the a bore (not shown) for the tubular line 43 which is alignedwith the tubular member bore 140 in the part 119 b and with the openingin the plate member 132. As can be appreciated, the machining of thispart 119 c is straightforward in drilling three holes. The ends of theconnecting part 119 c are provided with exterior chamfered bevels andinterior wall recesses as discussed before so that the parts 119 b and119 c and the parts 119 c and 119 d can be aligned and welded to oneanother while leaving interior wash out pockets 142 at the weldedjoints. A washout pocket provides a clear opening fluid access betweenthe full opening bore and the side pocket bore. As shown in FIG. 21, thewashout pocket is located at the bottom of the side pocket bore 125 awhich is the location for the coupling member 45.

The connecting part 119 d (FIG. 20B) is similar to connecting part 119 cwith a full opening bore 121 c, a side pocket bore 125 c and a tubularmember bore (not shown) except at the upper end of the offset pocketbore 125 b, internal latching recesses 144 are provided for the sidepocket tool. The tubular member bore is aligned with the tubular memberbore 140.

As shown in FIGS. 20A and 20B, a side pocket tool 117 such as a pressureand temperature gauge is sized to be retrievable received in andretrieved from the side pocket bore. At the upper end of the tool 117 isa conventional latching mechanism for releasably coupling to the sidepocket bore latch recess 144. At the lower end of the tool 117 is aninductive coupling member with a socket 148 to receive the probe 45 a inthe side pocket bore. Pressure in the well bore is sensed by the tool117 and transmitted to the earth's surface via an electrical conductorconnected to the probe 45 a.

Connecting housing part 119 e (FIG. 20B, FIG. 20C, FIG. 23) has a fullopening bore 121 c and a side pocket bore 125 c where the full openingbore 121 c and the side pocket bore 125 c are connected to one anotherby an opening 152 defined by parallel walls 150 which are spaced apartby a distance equal to the diameter of the side pocket bore 125 c. Theopening 152 permits the tool 117 to enter the side pocket bore. Tofacilitate the entry of a tool the upper surfaces of the walls 150 arebeveled at 154. The part 119 e has a connecting tubular member bore 140b which is sized to receive a tubular protection pipe 160. In transversealignment position with the connecting bore 140 b is a second pipe bore162 arranged so that the bore 140 c and the bore 162 straddle thecentral axis for the side pocket bore 125 c and are disposed slightlymore toward the central axis of the part 119 e. The bore 140 b and thebore 162 respectively receive two pipe members 160 and 164 which providea longitudinally extending parallel guide recess for guidance of thetool by the side kicker to position the tool for alignment in the sidepocket bore. This is illustrated more clearly in FIG. 25.

The part 119 f (FIG. 20C and FIG. 20D) is merely a tubular member whichhas beveled exterior ends with interior recesses for the washoutfunction as described heretofore and defines an upper recess 167 whichprovides open communication with a full opening bore through thehousing.

The top housing part 119 g (FIG. 20D) is cylindrically shaped with anoffset bore with a tubular deflector 36B which provides a full openingbore 121 e. The upper end of the housing part 119 g has an offset borewhich is threaded for connection to a string of tubing 14. In the solidsection of the part 119 g is a blind bore 166 to receive the dummyalignment pipe 164 and a through bore 168 to align with the bore 140 forthe tubular member 43 and to receive the upper end of the pipe member160. The upper end of the part 119 f with the threaded bore 168 is shownand described with respect to FIG. 27.

Referring now to FIG. 27, a partial detail in cross-section of the takeout connection in the top head part 119 g is illustrated and in FIGS. 28and 29, upper and lower portions of the mandrel are shown in partialcross-section to illustrate a part of the assembly procedure.

In FIG. 27, the through bore 168 in the top part 119 g receives thetubular electrical conduit member 43 containing the electrical conductor43 c which is connected to a “Kemlon” connector 172. The “Kemlon”connector 172 has wrench flats 173 and a lower body portion 174 with alower threaded bore 174 a and a downwardly facing tapered seating seatwhich engages the upper end of the tubular conduit member 43. A tubularconnector member 175 together with an autoclave sealer cap 176 areslidably received on the end of the tubing member 43 when it isinitially projected exterior to the top part 119 g in assembly. Theconnector member 175 has wrench flats 177 and an external threadedportion 178. The tubing member 43 projects through the connector member175 and has an external left hand thread to receive a locking nut 179.The body portion 174 has a lower bore portion with an internal threadwhich receives the nut 179 on the end of the tubular conduit 43. Thewrench flats 175 and 173 permit the body portion 174 to be threadedlyconnected to the connector member 175 and the end of the tube conduit 43can be engaged with the beveled seat in the body portion 174.

The upper end of the through bore 168 has an internal thread 180 tothreadedly receive a tubular retainer 181. Disposed between a shoulderon the tubular retainer and a shoulder in the through bore 168 is arecess which receives an annular copper ring 182. The metal ring 182 iscompressed when the retainer is threaded into the bore 168 to provide afluid tight seal for the pressure connector.

Referring to FIG. 28 and FIG. 29, a portion of the assembly steps isillustrated. As shown in the drawings when the inductive coupling member45 and the attached tubular conduit 43 are respectively moved upwardlyin the side pocket bore 125 and the bore 140 (FIG. 28), the tubularconduit 43 is located exterior of the through bore 168 in the tophousing part 119 g (FIG. 29). When the end of the tubing conduit 43 isexterior to housing part 119 g the autoclave cap 176 and the connectormember 175 are located on the end of the tubing 43. The copper sealingring 182 is placed on the body portion 174 and the conductor wire in thetubing 43 is connected in the “Kemlon” connector. The body portion 174is now held stationary and the connector member 175 is threadedlyattached to the body portion 174. The connected assembly is then loweredto a final position which also lowers the inductive coupling member 45to a final position. The retainer 181 is slid over the body portion 174and screwed into the top part 199 g which provides a metal to metal seal182 in the bore 168. At the lower end of the side pocket mandrel, theinductive coupler 45 is attached to the plate 132 and the plate 132 isattached to the housing part.

From the forgoing description it can be appreciated that the side pocketmandrel is constructed principally from cylindrical shaped outer partswith bores where necessary to define a full opening bore through theparts, a offset pocket bore, and a tubular member bore for passage of atubular member and having adjacent ends with exterior weld chamfers andinterior wall recesses to provide fluid access openings between the fullopening bore and the offset pocket bore. The simplicity of manufacturepermits the alignment of access openings with adjacent parts andeliminates heat treating because the exterior welding can beaccomplished with affecting the strength of the materials.

It will be apparent to those skilled in the art that various changes maybe made in the invention without departing from the spirit and scopethereof and therefore the invention is not limited by that which isdisclosed in the drawings and specifications but only as indicated inthe appended claims.

What is claimed is:
 1. A side pocket mandrel for use with a tubingstring in a well bore traversing earth formations including: anelongated side pocket housing having a full opening bore located along alongitudinal axis for said housing, said side pocket housing having (1)a laterally offset upper recess in open communication with said fullopening bore for receiving a well tool moved laterally from said fullopening bore, and (2) a lower laterally offset pocket bore in saidhousing for receiving said well tool; said side pocket housing having atleast one laterally offset, longitudinally extending and separatelylocated pipe bore extending through said side pocket housing alongsideof said offset pocket bore for connecting said upper recess to a lowerrecess below said offset pocket bore; said side pocket housing having atleast one longitudinally extending outlet bore extending between saidupper recess and the exterior of the side pocket housing at its upperend; at least one pipe member extending through said upper recessbetween said outlet bore and said pipe bore; a communication couplingmember disposed in the lower end of the pocket bore for communicationwith said well tool, said coupling member having a connecting electricalconduit extending into the lower recess and through the pipe bore andthe pipe member to the outlet bore.
 2. The apparatus as set forth inclaim 1 wherein said lower recess is within the body of the side pocketmandrel and further including a tubular member disposed in the lower endof said housing and defining a portion of said full opening bore andenclosing said lower recess to define a chamber enclosing the portion ofthe electrical conduit disposed within said lower recess; and a pressureconnector disposed in said outlet bore for coupling said electricalconduit to an external wire connector.
 3. The apparatus as set forth inclaim 1 wherein said housing includes separate cylindrically shapedparts connected together where some of the parts define the full openingbore, the offset pocket bore and the pipe bore.
 4. The apparatus as setforth in claim 3 wherein some of the parts have exterior bevels forwelding and have interior recesses for providing a fluid access area. 5.The apparatus as set forth in claim 1 wherein said housing has secondaligned pipe bores located in facing surfaces of said first recess forreceiving a second pipe member where said second pipe bores and saidsecond pipe member and the one pipe member are aligned and respectivelylocated on either side of a central axis for said side pocket bore witha spacing to enhance the guidance of said well tool into said sidepocket bore.
 6. The apparatus as set forth in claim 1 and furtherincluding more than one offset pocket bore for retreivably receiving asecond well tool.
 7. The apparatus as set forth in claim 1 and furtherincluding a longitudinally extending bottom outlet bore extendingbetween said lower recess and the exterior of the side pocket housingfor receiving an electrical conduit extending from the lower recess, anda second pressure connector disposed in said bottom outlet bore forcoupling said electrical conduit to an external wire connector.
 8. Theapparatus as set forth in claim 1 wherein said housing includes (1) anupper head part defining an upper end surface of the upper recess anddefining at least a full opening bore and an outlet bore, (2) anintermediate tubular part for defining said upper recess, (3) a guidemember part having a section of the pipe bore, a section of the offsetpocket bore and a section of the full opening bore where said section ofthe full opening bore and said section of the offset pocket bore areopen to one another by parallel wall surfaces spaced to guide a welltool into the section of the side pocket bore, (4) an upper offsetpocket part having another section of the full opening bore, an uppersection of the offset pocket bore and a section of the pipe bore, (5) alower offset pocket part having still another section of the fullopening bore, a lower section of the offset pocket bore and a section ofthe pipe bore, (6) a coupling part having still another section of thefull opening bore, a section of the offset pocket bore and a section ofthe pipe bore and further having an external coupling threaded section,(7) a bottom member part with a tubular recess having an internalthreaded section for threaded coupling with said coupling part and fordefining the lower recess, said bottom member part having a section ofthe full opening bore located offset from the central axis of the bottommember part, said parts (1) through (6) having facing end surfaces withouter weld bevels and inner wall recesses whereby fluid wash areas areprovided at each connection and fluid communication is provided betweenparts (4) and (5) and between parts (5) and (6) for providing fluidaccess to the offset pocket bore.
 9. The apparatus as set forth in claim8 wherein said housing has second aligned pipe bores located in facingsurfaces of said first recess for receiving a second pipe member wheresaid second pipe bores and said second pipe member and the one pipemember are aligned and respectively located on either side of a centralaxis for said side pocket bore with a spacing to enhance the guidance ofsaid well tool into said side pocket bore.
 10. The apparatus as setforth in claim 9 and further including more than one offset pocket borefor retreivably receiving a second well tool.
 11. The apparatus as setforth in claim 10 and further including a longitudinally extendingbottom outlet bore extending between said lower recess and the exteriorof the side pocket housing for receiving an electrical conduit extendingfrom the lower recess, and a second pressure connector disposed in saidbottom outlet bore for coupling said electrical conduit to an externalwire connector.
 12. The apparatus as set forth in claim 8 and furtherincluding more than one offset pocket bore for retreivably receiving asecond well tool.
 13. The apparatus as set forth in claim 12 and furtherincluding a longitudinally extending bottom outlet bore extendingbetween said lower recess and the exterior of the side pocket housingfor receiving an electrical conduit extending from the lower recess, anda second pressure connector disposed in said bottom outlet bore forcoupling said electrical conduit to an external wire connector.
 14. Theapparatus as set forth in claim 1 wherein said electrical conduitincludes at it's upper end, connector means including a nut memberthreadedly connected to the electrical conduit and a tubular connectorelement with wrench flats disposed on said conduit below said nutmember, and said pressure connector and said connector element having athreaded interconnection, said through bore and said pressure connectorhaving facing surfaces for defining a sealing recess and a metal sealingring disposed in said recess; and a tubular retainer collar disposed onsaid pressure connector and having a threaded interconnection with saidthrough bore for locking said pressure connector in a sealing conditionin said through bore.
 15. A method for assembling a side pocket mandrelto provide a top entry electrical connection from a bottom location inthe side pocket mandrel comprising the steps of: connecting end to end anumber of cylindrically shaped parts in a sequence to form an elongatedside pocket housing having a full opening bore located along alongitudinal axis where said side pocket housing has (1) a laterallyoffset upper recess in open communication with said full opening borefor receiving a well tool moved laterally from said full opening bore,(2) a lower laterally offset pocket bore in said side pocket housing forreceiving said well tool, (3) at least one laterally offset,longitudinally extending and separately located pipe bore extendingthrough said side pocket housing alongside of said offset pocket borefor connecting said upper recess to a location below the offset pocketbore and (4) at least one longitudinally extending outlet bore extendingbetween said upper recess and the exterior of the side pocket housing atits upper end; while connecting said parts, locating at least one pipemember in position to extend through said upper recess between saidoutlet bore and said pipe bore and connect the pipe bore in said sidepocket housing to said outlet bore; connecting a communication couplingmember to a flexible tubular connecting electrical conduit and passingthe electrical conduit through the pipe bore to exit to the exterior atthe top end of the housing (and connecting a pressure connector with anexternal wire connector to said electrical conduit); affixing thecommunication coupling member in the lower end of the offset pocketbore.
 16. The method as set forth in claim 15 including the steps ofconnecting parts at locations intermediate and at the lower end of thehousing where the parts have exterior bevels for welding and haveinterior annular recesses for providing fluid access from the fullopening bore to the side pocket bore.